*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.box{
    position: absolute;
    width: 1000px;
    height: 800px;
    left:0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: auto;
    background-color: aquamarine;
}
img{
    width: 25px;
    height: 25px;
}
.nc{
    height: 25px;
    float: left;
}
.p1{
    margin-top: 10px;
    width: 500px;
    height: 75px;
}
.s1{
    width: 100px;
    height: 50px;
    background-color: green;
}
ul{
    margin-top: 50px;
    list-style:none;
}
li{
    display: flex;
    color: red;
    
}
.b1{
    color: skyblue;
}
p{
    font-size: 15px;
}